Arctic Cat ATV 250 Utility 2009, Service Manual

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2-4
8. Place the filter in the air filter housing making sure
it is properly seated and secure with the clamp.
9. Install the air filter housing cover and secure with
the retaining clips; then install the seat making
sure it locks securely.
CHECKING/DRAINING DRAIN TUBE
Periodically check the drain tube for gasoline or oil
accumulation. If noticed, remove the drain tube cap
from beneath the housing and drain the gasoline or oil
into a suitable container; then install and secure the
tube cap.
KM114
Valve/Tappet Clearance
To check and adjust valve/tappet clearance, use the
following procedure.
„
NOTE: The seat assembly, side panels, and gas
tank must be removed for this procedure.
1. Remove the timing inspection plug; then remove
the cylinder head cover (see Section 3 - Removing
Top-Side Components).
2. Rotate the crankshaft so the “T” mark on the fly-
wheel aligns with the index mark on the right-side
crankcase cover.
„
NOTE: At this point, the round hole in the cam-
shaft gear should be up.
3. Place Tappet Adjuster onto the jam nut securing
the tappet adjuster screw; then rotate the adjuster
dial clockwise until the end is seated in the tappet
adjuster screw.
4. While holding the adjuster dial in place, use the
adjuster handle and loosen the jam nut; then rotate
the tappet adjuster screw clockwise until friction is
felt.
5. Align the adjuster handle with one of the marks on
the adjuster dial.
6. While holding the adjuster handle in place, rotate
the adjuster dial counterclockwise until proper
valve/tappet clearance is attained.
„
NOTE: Refer to the appropriate specifications in
Section 3 for the proper valve/tappet clearance.
„
NOTE: Rotating the adjuster dial counterclock-
wise will open the valve/tappet clearance by 0.05
mm (0.002 in.) per mark.
7. While holding the adjuster dial at the proper clear-
ance setting, tighten the jam nut securely with the
valve adjuster handle.
8. Place the cylinder head cover with a new O-ring
into position; then tighten the cover securely.
KM703
9. Install the timing inspection plug.
Testing Engine
Compression
To test engine compression, use the following procedure.
1. Remove the high tension lead from the spark plug.
2. Using compressed air, blow any debris from
around the spark plug.
3. Remove the spark plug; then attach the high ten-
sion lead to the plug and ground the plug on the
cylinder head well away from the spark plug hole.
4. Attach the Compression Gauge.
„
NOTE: The engine must be warm and the battery
must be fully charged for this test.
5. While holding the throttle lever in the full-open
position, crank the engine over with the electric
starter until the gauge shows a peak reading (five
to 10 compression strokes).
! WARNING
Always wear safety glasses when using compressed air.
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